After an audit, I noticed that in the Domain Admins group of our
domain, there is an account named Administrator. As my engineers told
me, this account is created by default when you create a new domain
and cannot be deleted or disabled. Is this true? I am not convinced
yet.

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Thanks Kurt.
I guess that won't do. As far as I know, and based on the tests that we've been performing, it only provides for a way so in case the disks are robbed/stolen they won't be readable unless you have a key (stored in a say removable USB drive).
It won't prevent the system admin from readi